新疆昌吉中风化泥岩地区锚杆基础承载试验研究

Experimental Research on Bearing Capacity of Anchoring Foundation in Intermediary Weathered Mudrock Areas in Changji,Xinjiang

为获取新疆昌吉泥岩地区岩石锚杆设计参数,选取典型中风化泥岩地区进行锚杆基础现场试验,获得了锚杆基础极限抗拔力和群锚效应系数,分析了锚杆的轴力、位移与应力变化规律,给出了基础适宜锚固深度值和影响范围值,并进行了数值试验验证。结果表明,昌吉中风化泥岩单锚基础极限抗拔力为450 k N,群锚效应系数为0.8,基础适宜锚固深度为3 m,建议基础试验保护范围为3 m,可为新疆昌吉泥岩地区输电线路锚杆基础设计提供参考。

In order to obtain the design parameters of rock anchors in mudrock areas in Changji, Xinjiang, typical intermediary weathered mudrock areas are chosen to conduct on-site tests of anchoring foundation. Through these tests, the uplift resistance limitation and grouped anchors effect factor of anchoring foundation are obtained, and the change rules of axial force, displacement and stress of anchor are analyzed. The proper values of foundation anchoring depth and impacting range are proposed. The resuhs of ou-site tests are also verified by numerical analyses. The results show that, in intermediary weathered mudrock area in Changji, the uplift resistance limitation of single anchor foundation is 450 kN, the grouped anchors＇ effect factor is 0.8, the proper anchoring depth is 3 m, and the proposed protection range of foundation test is 3 m. The test results will provide references for the design of anchoring foundation of transmission line in Changji mudrock area.